Supervise children while they eat. Make them eat slowly. Don't let them crawl or run around with food in their mouths.
Anything that can fit through a toilet-paper tube (other than food) can choke a child and should be kept out of reach.
Never give balloons to infants or young children. They are extremely easy to choke on and can be deadly.
Information provided here is not intended to replace your physician's advice. In any emergency situation, it's best to call your child's doctor or 911 as quickly as possible.